Multicarrier system and data modulation and demodulation method and device for multicarrier system

ABSTRACT

A multicarrier system and data modulation and demodulation methods and devices for the multicarrier system are provided. The data modulation method includes: performing cyclic shifting on data sequences of L continuous symbols respectively, L≥2; and modulating the cyclically shifted data sequences by use of a waveform function, an independent variable range of the waveform function being greater than or equal to a symbol interval of the L modulated symbols. The technical solution solves the technical problems in which the related art is not compatible with a LTE system or effectively suppressing out-of-band leakage or flexibly adjusting a symbol interval to adapt to different channel environments and exhibits poor demodulation performance, thus achieving effective suppression of the out-of-band leakage, having higher compatibility with the LTE system and improving demodulation performance and flexibility of adjusting a symbol interval by simple cyclic shifting.

TECHNICAL FIELD

The disclosure relates to the field of communication, and particularlyto a multicarrier system and data modulation and demodulation methodsand devices for the multicarrier system.

BACKGROUND

A Long Term Evolution (LTE) technology is a 4th-Generation (4G) radiocellular communication technology. LTE adopts an Orthogonal FrequencyDivision multiplexing (OFDM) technology and time-frequency resourcesformed by subcarriers and OFDM symbols form radio physicaltime-frequency resources of an LTE system. At present, the OFDMtechnology has been extensively applied to radio communication. Withadoption of a Cyclic Prefix (CP), a CP-OFDM system may solve a multipathdelay problem well and divide a frequency selective channel into a setof parallel flat channels, so that a channel estimation method isgreatly simplified and relatively high channel estimation accuracy isachieved. However, since the CP-OFDM system has bigger spectrum leakageand is sensitive to a frequency offset and time offset between adjacentsub-bands, interference between the sub-bands may further be brought.

At present, suppression of out-of-band leakage becomes an importantdirection for researches on 5th-Generation (5G) technologies. Severalnew multicarrier solutions are proposed in a related art, specificallyincluding Filter Bank Multicarrier (FBMC), Generalized FrequencyDivision Multiplexing (GFDM), Universal Filtered Multicarrier (UFMC),Filtered OFDM (F-OFDM) and the like. FBMC may restrain out-of-bandleakage well but is incompatible with the LTE technology, and has aproblem in channel estimation and in combination with a Multiple InputMultiple Output (MIMO) technology and the like. GFDM does not have anideal suppression effect of out-of-band leakage but has a higherprocessing complexity which causes inflexible regulation of a symbolinterval. UFMC and F-OFDM do not have ideal out-of-band leakagesuppression effects either, and moreover, cannot improve performanceunder the condition of keeping out-of-band unchanged by adjusting asymbol interval.

Until now, there is yet no effective technical solution for effectivelysuppressing out-of-band leakage and flexibly adjusting a symbol intervalto adapt to different channel environments under the condition that therelated art is not compatible with an LTE system and has poordemodulation performance.

SUMMARY

Embodiments of the disclosure provide a multicarrier system and datamodulation and demodulation methods and devices for the multicarriersystem, so as at least to solve the problems that out-of-band leakagecannot be restrained effectively and a symbol interval cannot beflexibly adjusted to adapt to different channel environments under thecondition that the related art cannot be compatible with an LTE systemand has poor demodulation performance.

According to an embodiment of the disclosure, a data modulation methodfor a multicarrier system is provided, which may include that: cyclicshifting is performed on time-domain data sequences of L continuoussymbols respectively, L≥2; and the cyclically shifted time-domain datasequences are modulated by use of a waveform function, an independentvariable range of the waveform function being greater than or equal to asymbol interval of the L modulated symbols.

Optionally, the data sequences of the L continuous symbols may betime-domain data sequences obtained by performing Inverse Fast FourierTransform (IFFT) on frequency-domain data of the L continuous symbolsrespectively.

Optionally, the length of the independent variable range of the waveformfunction may be N×T1, N being a real number greater than or equal to 1and T1 being the symbol interval of the L continuous modulated symbols.

Optionally, the method may further include that: a difference valuebetween cyclic shifts of adjacent symbols in the L continuous symbols isdetermined according to a value of T1.

Optionally, the cyclic shifts of the adjacent symbols may meet one ofthe following formulae:

mod((mod(Y(i+1), T0)−mod(Y(i), T0)+T0), T0)=mod(T1, T0); and

T0−mod((mod(Y(i+1), T0)−mod(Y(i), T0)+T0), T0)=mod(T1, T0), where Y(1),Y(2) . . . Y(L) may be the cyclic shifts and may be real numbers, i maybe an integer between [1, L−1] and T0 may be a reciprocal of an intervalbetween adjacent subcarriers of the frequency-domain data beforeexecution of the IFFT.

Optionally, modulation may include Filter Bank (FB) modulation.

Optionally, the waveform function may include one of: a root raisedcosine function, a raised cosine function, a piecewise function and arectangular function.

Optionally, a maximum time span between independent variablescorresponding to nonzero function values of the waveform function may begreater than or equal to 2T1, the maximum time span being a time spanbetween the independent variables corresponding to two endpoints of thenonzero function values in the independent variable range.

Optionally, the maximum time span may be greater than or equal to 3T1.

Optionally, T1=aT0, a being [15/14, 2] or [8/7, 2].

Optionally, the operation that the cyclically shifted data sequences ofthe L continuous symbols are modulated by use of the waveform functionmay include that: independent variable shifting is performed on thewaveform function corresponding to the L continuous symbolsrespectively; and a grouped linear operation is performed on thewaveform function having been subjected to the independent variableshifting and the cyclically shifted data sequences of the L continuoussymbols.

Optionally, the independent variable shifting may be performed on thewaveform function corresponding to the L continuous symbols in thefollowing manner: g(t−D(i)), where g(t) may be the waveform function,D(i) may be an independent variable shift of the waveform functioncorresponding to an ith symbol, D(i+1)−D(i)=T1 and i may be an integerbetween [1, L].

Optionally, the operation that the grouped linear operation is performedon the waveform function having been subjected to the independentvariable shifting and the cyclically shifted data sequences of the Lcontinuous symbols may include that: first M-fold sampling and groupingis performed on discrete data sequences of the L continuous symbolshaving been subjected to the cyclical shifting to obtain M sets of datasequences S(m), m=1, 2, . . . , M and a length of each set of datasequence being L; second M-fold sampling and grouping is performed on adiscrete function form of g(t−D(i)) corresponding to the ith symbol toobtain M sets of data sequences Yi(m), m=1, 2, . . . , M, a length ofeach set of data sequence being G and G being greater than or equal toN; a linear operation is performed on S(m) and L Yi(m) to generate datasequences R(m), namely

${{R(m)} = {{S(m)} \times \begin{bmatrix}{Y\; 1(m)} \\{Y\; 2(m)} \\\vdots \\{{YL}(m)}\end{bmatrix}}},$

m=1, 2, . . . , M; and the M sets of data sequences R(m) may be arrangedaccording to a predetermined rule to obtain the modulated data sequencesof the L continuous symbols, M being the number of the time-domain datasequences within time T0 and T0 being the reciprocal of the intervalbetween the adjacent subcarriers of the frequency-domain data beforeexecution of the IFFT.

Optionally, sampling may be performed on a continuous function form ofthe waveform function to obtain the discrete function form of g(t−D(i))corresponding to the ith symbol, a sampling interval being a timeinterval between adjacent discrete data in the time-domain datasequences of the L continuous symbols.

Optionally, the L continuous symbols may be symbols on one subframe orone resource block in the multicarrier system.

According to another embodiment of the disclosure, a data demodulationmethod for a multicarrier system is provided, which may include that:modulated data is received, the modulated data being data obtained byperforming first cyclic shifting on data sequences of L continuoussymbols respectively and modulating the data sequences having beensubjected to the first cyclic shifting by use of a specified waveformfunction; and demodulation is performed on the data by use of thespecified waveform function to obtain the data sequences of the Lcontinuous symbols.

Optionally, the method may further include that: second cyclic shiftingis performed on the data sequences of the L continuous symbolsrespectively; and original data of the modulated data is acquiredaccording to the data sequences having been subjected to the secondcyclic shifting.

Optionally, the method may further include that: a difference valuebetween cyclic shifts of adjacent symbols in the L continuous symbols isdetermined according to a value of T1, T1 being a symbol interval of theL continuous modulated symbols.

Optionally, a cyclic shift of the second cyclic shifting and a cyclicshift of first cyclic shifting may be opposite in direction and the samein modulus value.

Optionally, after the operation that the second cyclic shifting isperformed on the time-domain sequences of the L continuous symbols, themethod may further include that: Fast Fourier Transform (FFT) andchannel equalization and detection are performed on the data.

According to still another embodiment of the disclosure, a datamodulation device for a multicarrier system is provided, which mayinclude: a cyclic shifting module, configured to perform cyclic shiftingon data sequences of L continuous symbols respectively, L≥2; and amodulation module, configured to modulate the cyclically shifted datasequences by use of a specified waveform function, an independentvariable range of the waveform function being greater than or equal to asymbol interval of the L modulated symbols.

Optionally, the data sequences of the L continuous symbols may betime-domain data sequences obtained by performing IFFT onfrequency-domain data of the L continuous symbols respectively.

Optionally, the independent variable range of the waveform function maybe N×T1, N being a real number greater than or equal to 1 and T1 beingthe symbol interval of the L continuous modulated symbols.

Optionally, the cyclic shifting module may further be configured todetermine a difference value between cyclic shifts of adjacent symbolsin the L continuous symbols according to a value of T1.

Optionally, the cyclic shift of the adjacent symbols may meet one of thefollowing formulae:

mod((mod(Y(i+1), T0)−mod(Y(i), T0)+T0), T0)=mod(T1, T0) and

T0−mod((mod(Y(i+1), T0)−mod(Y(i), T0)+T0), T0)=mod(T1, T0), where Y(1),Y(2) . . . Y(L) may be the cyclic shifts and may be real numbers, i maybe an integer between [1, L−1] and T0 may be a reciprocal of an intervalbetween adjacent subcarriers of the frequency-domain data beforeexecution of the IFFT.

Optionally, the modulation module may further be configured to performindependent variable shifting on the waveform function corresponding tothe L continuous symbols and perform a grouped linear operation on thewaveform function having been subjected to the independent variableshifting and the cyclically shifted data sequences of the L continuoussymbols.

Optionally, the modulation module may further be configured to performthe independent variable shifting on the waveform function correspondingto the L continuous symbols in the following manner: g(t−D(i)), whereg(t) may be the waveform function, D(i) may be an independent variableshift of the waveform function corresponding to an ith symbol,D(i+1)−D(i)=T1 and i may be an integer between [1, L].

Optionally, the modulation module may further be configured to: performfirst M-fold sampling and grouping on the cyclically shifted discretedata sequences of the L continuous symbols to obtain M sets of datasequences S(m), m=1, 2, . . . , M and a length of each set of datasequence being L; perform second M-fold sampling and grouping on adiscrete function form of g(t−D(i)) corresponding to the ith symbol toobtain M sets of data sequences Yi(m), m=1, 2, . . . , M, a length ofeach set of data sequence being G and G being greater than or equal toN; perform a linear operation on S(m) and L Yi(m) to generate datasequences R(m), namely

${{R(m)} = {{S(m)} \times \begin{bmatrix}{Y\; 1(m)} \\{Y\; 2(m)} \\\vdots \\{{YL}(m)}\end{bmatrix}}},$

m=1, 2, . . . , M; and arrange the M sets of data sequences R(m)according to a predetermined rule to obtain the modulated data sequencesof the L continuous symbols, M being the number of the time-domain datasequences within time T0 and T0 being the reciprocal of the intervalbetween the adjacent subcarriers of the frequency-domain data beforeexecution of the IFFT.

According to yet another embodiment of the disclosure, a datademodulation device for a multicarrier system is provided, which mayinclude: a receiving module, configured to receive modulated data, themodulated data being data obtained by performing first cyclic shiftingon data sequences of L continuous symbols respectively and modulatingthe data sequences having been subjected to the first cyclic shifting byuse of a specified waveform function; and a demodulation module,configured to perform demodulation on the data by use of the specifiedwaveform function to obtain the data sequences of the L continuoussymbols.

Optionally, the device may further include: a cyclic shifting module,configured to perform second cyclic shifting on the data sequences ofthe L continuous symbols respectively; and an acquisition module,configured to acquire original data of the modulated data according tothe data sequences having been subjected to the second cyclic shifting.

Optionally, the cyclic shifting module may further be configured todetermine a difference value between cyclic shifts of adjacent symbolsin the L continuous symbols according to a value of T1, T1 being asymbol interval of the L continuous modulated symbols.

Optionally, the device may further include a processing module,configured to perform FFT and channel equalization and detection on thedata.

According to another embodiment of the disclosure, a multicarrier systemis provided, which may include: a sending node and a receiving node. Thesending node may be configured to perform cyclic shifting on datasequences of L continuous symbols respectively, L≥2, and modulate thecyclically shifted data sequences by use of a specified waveformfunction, an independent variable range of the waveform function beinggreater than or equal to a symbol interval of the L modulated symbols.The receiving node may be configured to receive modulated data, themodulated data being data obtained by performing first cyclic shiftingon the data sequences of the L continuous symbols respectively andmodulating the data sequences having been subjected to first cyclicshifting by use of the specified waveform function, perform demodulationon the data by use of the specified waveform function to obtain the datasequences of the L continuous symbols, perform second cyclic shifting onthe data sequences of the L continuous symbols respectively and acquireoriginal data of the modulated data according to the data sequenceshaving been subjected to the second cyclic shifting.

According to another embodiment of the disclosure, a storage medium isalso provided. The storage medium is configured to store a program codefor executing the following operations including: performing cyclicshifting on data sequences of L continuous symbols respectively, L≥2;and modulating the cyclically shifted data sequences by use of aspecified waveform function, an independent variable range of thewaveform function being greater than or equal to a symbol interval ofthe L modulated symbols.

Optionally, the storage medium may be further configured to store aprogram code for executing the following operation of: determining adifference value between cyclic shifts of adjacent symbols in the Lcontinuous symbols according to a value of T1.

Optionally, the storage medium may be further configured to store aprogram code for executing the following operation that: the cyclicshifts of the adjacent symbols meet one of the following formulae:

mod((mod(Y(i+1), T0)−mod(Y(i), T0)+T0), T0)=mod(T1, T0) and

T0−mod((mod(Y(i+1), T0)−mod(Y(i), T0)+T0), T0)=mod(T1, T0), where Y(1),Y(2) . . . Y(L) may be the cyclic shifts and may be real numbers, i maybe an integer between [1, L−1] and T0 may be a reciprocal of an intervalbetween adjacent subcarriers of the frequency-domain data beforeexecution of IFFT.

Optionally, the storage medium may be further configured to store aprogram code for executing the following operations including:performing independent variable shifting on the waveform functioncorresponding to the L continuous symbols; and performing a groupedlinear operation on the waveform function having been subjected to theindependent variable shifting and on the cyclically shifted datasequences of the L continuous symbols.

Optionally, the storage medium may be further configured to store aprogram code for executing the following operation: performingindependent variable shifting on the waveform function corresponding tothe L continuous symbols in the following manner: g(t−D(i)), where g(t)may be the waveform function, D(i) may be an independent variable shiftof the waveform function corresponding to an ith symbol, D(i+1)−D(i)=T1and i may be an integer between [1, L].

Optionally, the storage medium may be further configured to store aprogram code for executing the following operations: performing firstM-fold sampling and grouping on the cyclically shifted discrete datasequences of the L continuous symbols to obtain M sets of data sequencesS(m), m=1, 2, . . . , M and a length of each set of data sequence beingL; performing second M-fold sampling and grouping on a discrete functionform of g(t−D(i)) corresponding to the ith symbol to obtain M sets ofdata sequences Yi(m), m=1, 2, . . . , M, a length of each set of datasequence being G and G being greater than or equal to N; performing alinear operation on S(m) and L Yi(m) to generate data sequences R(m),namely

${{R(m)} = {{S(m)} \times \begin{bmatrix}{Y\; 1(m)} \\{Y\; 2(m)} \\\vdots \\{{YL}(m)}\end{bmatrix}}},$

m=1, 2, . . . , M; and arranging the M sets of data sequences R(m)according to a predetermined rule to obtain the modulated data sequencesof the L continuous symbols, M being the number of the time-domain datasequences within time T0 and T0 being the reciprocal of the intervalbetween the adjacent subcarriers of the frequency-domain data beforeexecution of the IFFT.

According to another embodiment of the disclosure, a storage medium isalso provided. The storage medium is configured to store a program codefor executing the following operations: receiving modulated data, themodulated data being data obtained by performing first cyclic shiftingon data sequences of L continuous symbols respectively and modulatingthe data sequences having been subjected to first cyclic shifting by useof a specified waveform function; and performing demodulation on thedata by use of the specified waveform function to obtain the datasequences of the L continuous symbols.

Optionally, the storage medium may be further configured to store aprogram code for executing the following operations: performing secondcyclic shifting on the data sequences of the L continuous symbolsrespectively; and acquiring original data of the modulated dataaccording to the data sequences having been subjected to the secondcyclic shifting.

Optionally, the storage medium may be further configured to store aprogram code for executing the following operation: performing FFT andchannel equalization and detection on the data.

Through the embodiments of the disclosure, cyclic shifting is performedon the data sequences of the L continuous symbols respectively, L andthe cyclically shifted data sequences are modulated by use of aspecified waveform function, an independent variable range of thewaveform function being greater than or equal to a symbol interval ofthe L modulated symbols, thereby solving the technical problems thatout-of-band leakage cannot be effectively suppressed and a symbolinterval cannot be flexibly adjusted to adapt to different channelenvironments under the situation that the related art is not compatiblewith an LTE system and has poor demodulation performance. Thus, theout-of-band leakage can be suppressed well, widths of main lobes ofsubcarriers on a frequency domain are decreased, overlapping of the mainlobes of adjacent subcarriers is further avoided, interference betweenthe adjacent subcarriers is cancelled, relatively high compatibilitywith the LTE system can be achieved and meanwhile, demodulationperformance and symbol interval regulation flexibility are improved bysimple cyclic shifting operations.

BRIEF DESCRIPTION OF DRAWINGS

The drawings described herein are adopted to provide a furtherunderstanding to the disclosure and form a part of the application.Schematic embodiments of the disclosure and descriptions thereof areadopted to explain the disclosure and not intended to form improperlimits to the disclosure. In the drawings:

FIG. 1 is a diagram of a network architecture according to an embodimentof the disclosure;

FIG. 2 is a flowchart of a data modulation method for a multicarriersystem according to an embodiment of the disclosure;

FIG. 3 is a flowchart of a data modulation method for a multicarriersystem according to an optional embodiment of the disclosure;

FIG. 4 is a flowchart of a data demodulation method for a multicarriersystem according to an embodiment of the disclosure;

FIG. 5 is a structure block diagram of a data modulation device for amulticarrier system according to an embodiment of the disclosure;

FIG. 6 is a structure block diagram of a data demodulation device for amulticarrier system according to an embodiment of the disclosure;

FIG. 7 is a first structure block diagram of a data demodulation devicefor a multicarrier system according to an optional embodiment of thedisclosure; and

FIG. 8 is a second structure block diagram of a data demodulation devicefor a multicarrier system according to an optional embodiment of thedisclosure.

DETAILED DESCRIPTION

The disclosure will be described below with reference to the drawingsand in combination with the embodiments in detail. It is to be notedthat the embodiments in the application and characteristics in theembodiments may be combined without conflicts.

It is to be noted that terms “first”, “second” and the like in thespecification, claims and drawings of the disclosure are not to describea specific sequence or order but to distinguish similar objects.

Embodiment 1

FIG. 1 is a diagram of a network architecture according to an embodimentof the disclosure. The embodiment of the application may be run on thenetwork architecture shown in FIG. 1. As shown in FIG. 1, the networkarchitecture includes a sending node 12 and a receiving node 14. Thesending node 12 sends cyclically shifted and modulated data to thereceiving node 14 and the receiving node 14 demodulates the data,performs cyclic shifting again and acquires original data according to acyclically shifted data sequence. The sending node 12 and the receivingnode 14 may be devices such as base stations, terminals or relayequipment.

The embodiment provides a data modulation method for a multicarriersystem running on the network architecture shown in FIG. 1. FIG. 2 is aflowchart of a data modulation method for a multicarrier systemaccording to an embodiment of the disclosure. As shown in FIG. 2, theflow includes the following operations.

In S202, cyclic shifting is performed on data sequences of L continuoussymbols respectively, L≥2.

In S204, the cyclically shifted data sequences are modulated by use of aspecified waveform function. An independent variable range of thewaveform function is greater than or equal to a symbol interval of the Lmodulated symbols.

Through the above operations, cyclic shifting is performed on the datasequences of the L continuous symbols respectively, L≥2, and thecyclically shifted data sequences are modulated by use of the specifiedwaveform function. The independent variable range of the waveformfunction is greater than or equal to the symbol interval of the Lmodulated symbols. Therefore, the technical problems of incapability ofeffectively suppressing out-of-band leakage or flexibly adjusting asymbol interval to adapt to different channel environments under thecondition that the related art is incompatible with an LTE system andhas poor demodulation performance are solved. Thus, the out-of-bandleakage can be suppressed well, widths of main lobes of subcarriers on afrequency domain are decreased, overlapping of the main lobes ofadjacent subcarriers is further avoided, interference of the adjacentsubcarriers is cancelled, relatively high compatibility with the LTEsystem is achieved and, meanwhile, demodulation performance and symbolinterval regulation flexibility are improved by simple cyclic shiftingoperations.

Optionally, an execution body of the operations may be, but not limitedto, a base station, a terminal, relay equipment, a transmitting pointand the like.

In an optional embodiment, the data sequences of the L continuoussymbols are time-domain data sequences obtained by performing IFFT onfrequency-domain data of the L continuous symbols respectively. In theembodiment, adopting IFFT may effectively convert the frequency-domaindata into the time-domain data sequences. However, the disclosure is notlimited thereto.

Optionally, T0 is a reciprocal of an interval between adjacentsubcarriers of the frequency-domain data before execution of IFFT. Forexample, T0=F under the condition that the interval between the adjacentsubcarriers of the frequency-domain data is F and, when a bandwidth ofan LTE system is 10 MHz, IFFT may be performed on the L continuoussymbols respectively to obtain L time-domain data sequences Z(i), ibeing an integer between [1, L] and Z1(i) being an infinitely long datasequence taking T0 as a period. Then, T0=1024×Ts. Here, M is the numberof the time-domain data sequences in time T0 and, specifically, M=1024.Ts is a time interval between adjacent data. In addition, forsimplification, it may be set in LTE that a length of a time-domain datasequence obtained by IFFT processing over each symbol is T0.

Optionally, when it is set that the length of a time-domain datasequence obtained by IFFT processing over each symbol is T0, cyclicshifting is performed on data within T0. When it is set that thetime-domain data sequence obtained by IFFT processing over each symbolis an infinitely long data sequence taking T0 as a period, direct datashifting is equivalent to cyclic shifting within each period T0. Cyclicshifting of the data within T0 is adopted but not intended to limit theembodiment of the disclosure.

In an optional embodiment, the length of the independent variable rangeof the waveform function is N×T1, where N is a real number greater thanor equal to 1 and T1 is the symbol interval of the L continuous symbolsafter modulation. In the embodiment, optionally, N is a constant or avariable. When it is a constant, the independent variable range of thewaveform function is positively proportional to the symbol interval ofthe L symbols after modulation. However, no matter whether N is aconstant or a variable, the independent variable range of the waveformfunction is greater than or equal to the symbol interval of the Lmodulated symbols. Therefore, the out-of-band leakage is suppressedrelatively well, the widths of the main lobes of the subcarriers on thefrequency domain are decreased, overlapping of the main lobes of theadjacent subcarriers is further avoided and the interference between theadjacent subcarriers is canceled.

In an optional embodiment, a difference value of cyclic shifts ofadjacent symbols in the L continuous symbols is determined according toa value of T1. In the embodiment, the shift may be represented withtime, that is, the shift is equal to a product of the amount of shifteddata multiplied with Ts. Cyclic shifting is performed on the time-domaindata sequences Z1(i) having been subjected to IFFT to obtain datasequences Z2(i).

In an optional embodiment, the cyclic shifts of the adjacent symbolsmeet one of the following formulae: mod((mod(Y(i+1), T0)−mod(Y(i),T0)+T0), T0)=mod(T1, T0); and T0−mod((mod(Y(i+1), T0)−mod(Y(i), T0)+T0),T0)=mod(T1, T0), where Y(1), Y(2) . . . Y(L) are cyclic shifts and arereal numbers and i is an integer between [1, L−1]. In the embodiment,cyclic shifting adopts, but not limited to, rightward cyclic shiftingand may also adopt leftward cyclic shifting or a combination of the two.In the LTE system, there are 14 symbols in a 1 ms subframe and thus anaverage symbol interval is 1/14 ms. In the disclosure, the symbolinterval is flexibly changed by different cyclic shifting operations.When T1=T0, the cyclic shift is 0, which is equivalent to that no cyclicshifting operation is required to be performed. When T1>T0, the symbolinterval is larger than the reciprocal of the interval between theadjacent subcarriers. When T1<T0, the symbol interval is smaller thanthe reciprocal of the interval between the adjacent subcarriers. In caseof a relatively poor channel condition, the symbol interval T1 may beincreased, thereby achieving orthogonality of time/frequency-domain databetter and improving the demodulation performance. In case of arelatively good channel condition, the symbol interval T1 may be reducedand even be reduced to be smaller than T0 to implement super-Nyquisttransmission. Therefore, different cyclic shifting operations areperformed for flexible adaptation to changes of different channelenvironments.

Optionally, the cyclic shift may also be represented with the amount ofdiscrete data. Therefore, in the embodiment, Ts is a time intervalbetween adjacent discrete data in the time-domain data sequence. If theamount of discrete data in time T0 is K0, K0×Ts=T0. If the amount ofdiscrete data in time T1 is K1, K1×Ts=T1. Then, the cyclic shifts of theadjacent symbols meet one of the following formulae: mod((mod(Y(i+1),K0)−mod(Y(i), K0)+K0), K0)=mod(K1, K0) (cyclic shifting is rightwardcyclic shifting); and

K0−mod((mod(Y(i+1), K0)−mod(Y(i), K0)+K0), K0)=mod(K1, K0) (the cyclicshifting is leftward cyclic shifting), where Y(1), Y(2) . . . Y(L) areintegers and i is an integer between [1, L−1].

It is to be noted that, when the time-domain sequence obtained by IFFTprocessing over each symbol is arranged according to a column vector andthe data sequence is arranged from top to bottom, rightward cyclicshifting is equivalent to downward cyclic shifting. Similarly, leftwardcyclic shifting is equivalent to upward cyclic shifting.

In an optional embodiment, modulation includes FB modulation. In theembodiment, FB modulation may be called multi-phase filter modulation,multiple filters may be processed in parallel and an FB modulationparameter may be determined according to a specified waveform function.Adopting FB modulation may effectively and accurately implement parallelmodulation of the multiple filters.

In an optional embodiment, the waveform function includes one of: a rootraised cosine function, a raised cosine function, a piecewise functionand a rectangular function. In the embodiment, the raised cosinefunction may be a time-domain function obtained by FFT over afrequency-domain raised cosine function and may also directly be atime-domain raised cosine function. The root raised cosine function mayalso be a time-domain function obtained by FFT over a frequency-domainraised cosine function or is directly a time-domain function. Thepiecewise function refers to a function represented by combining nonzerofunction values with multiple mathematic expressions in differentindependent variable ranges, for example, a step function with multiplenonzero platform values. Adopting any one of the above functions as thewaveform function may ensure no interference and orthogonality betweenthe symbols.

Optionally, a time-domain length of the waveform function is extended byadding a value 0. For example, for a waveform function with a lengthN×T, a segment of independent variable range with a function value 0 maybe added to one side of an independent variable range to change a totallength of the independent variable range to be (N+1)×T.

In an optional embodiment, a maximum time span between independentvariables corresponding to nonzero function values of the waveformfunction may be greater than or equal to 2T1, the maximum time spanbeing a time span between the independent variables corresponding to twoendpoints of the nonzero function values in the independent variablerange.

In an optional embodiment, the maximum time span may also be greaterthan or equal to 3T1. When the maximum time span may also be greaterthan or equal to 3T1, the out-of-band leakage may be suppressed moreeffectively. In the embodiment, the waveform function may be bilaterallysymmetric about a midpoint of the independent variable range of thefunction as an axis, that is, function values of an NT1/2 segment on theleft and an NT1/2 segment on the right are bilaterally symmetric.Optionally, the specified waveform function may be a waveform functionpredetermined in a standard/protocol or a waveform function which is setfor a sending node by a corresponding node. For example, when thesending node is User Equipment (UE), a base station sets the waveformfunction for the UE.

In an optional embodiment, T1=aT0 and the value range of a is [15/14, 2]or [8/7, 2], so that subcarriers may also be mutually orthogonal andfree of interference in case of asynchronism.

In an optional embodiment, the operation that the cyclically shifteddata sequences of the L continuous symbols are modulated by use of thewaveform function may be implemented in the following manner:independent variable shifting is performed on the waveform functioncorresponding to the L continuous symbols respectively; and a groupedlinear operation is performed on the waveform function having beensubjected to independent variable shifting and on the cyclically shifteddata sequences of the L continuous symbols. In the embodiment, thewaveform function corresponding to the L continuous symbols may be thesame function or may be multiple different functions. In such amodulation manner, the out-of-band leakage may be suppressed relativelywell, the widths of the main lobes of the subcarriers on the frequencydomain may be decreased, overlapping of the main lobes of the adjacentsubcarriers is further avoided and the interference between the adjacentsubcarriers is canceled.

In an optional embodiment, independent variable shifting is performed onthe waveform function corresponding to the L continuous symbols in thefollowing manner: g(t−D(i)), where g(t) is the waveform function, D(i)is an independent variable shift of the waveform function correspondingto an ith symbol, D(i+1)−D(i)=T1 and i is an integer between [1, L].

In an optional embodiment, the operation that the grouped linearoperation is performed on the waveform function having been subjected toindependent variable shifting and the cyclically shifted data sequencesof the L continuous symbols may be implemented in the following manner:first M-fold sampling and grouping is performed on the cyclicallyshifted discrete data sequences of the L continuous symbols to obtain Msets of data sequences S(m), m=1, 2, . . . , M, and a length of each setof data sequence being L; second M-fold sampling and grouping isperformed on a discrete function form of g(t−D(i)) corresponding to theith symbol to obtain M sets of data sequences Yi(m), m=1, 2, . . . , M,a length of each set of data sequence being G and G being greater thanor equal to N; a linear operation is performed on S(m) and L Yi(m) togenerate data sequences R(m), namely

${{R(m)} = {{S(m)} \times \begin{bmatrix}{Y\; 1(m)} \\{Y\; 2(m)} \\\vdots \\{{YL}(m)}\end{bmatrix}}},$

m=1, 2, . . . , M; and the M sets of data sequences R(m) are arrangedaccording to a predetermined rule to obtain the modulated data sequencesof the L continuous symbols. In the embodiment, the linear operation maybe equivalent to filter processing. When T1=T0, the linear operation isequivalent to time-invariant filter processing or equivalent to aconvolutional operation of a time-invariant response function. WhenT14T0, the linear operation is equivalent to time-varying filterprocessing or equivalent to a convolutional operation of a time-varyingresponse function. Therefore, the linear operation over the M sets maybe equivalent to FB processing.

In an optional embodiment, sampling is performed on a continuousfunction form of the waveform function to obtain the discrete functionform of g(t−D(i)) corresponding to the ith symbol, a sampling intervalbeing a time interval between adjacent discrete data in the time-domaindata sequences of the L continuous symbols.

In the embodiment, when the waveform function is a continuous function,a discrete function value of the waveform function is obtained bysampling values of the continuous function, a sampling interval beingequal to the time interval between the adjacent discrete data in thetime-domain data sequence of each symbol. That is, the discrete value ofthe waveform function refers to a function value corresponding to anindependent variable value at the same moment with time-domain data ofeach symbol. After the data sequence of each symbol is repeatedlyextended into a data sequence with a length N×T1, the time intervalbetween the adjacent discrete data in the data sequence is Ts and theamount of the discrete data in time T is K. Then, K×Ts=T and N×K×Ts=N×T.Therefore, a data sequence with a length N×K includes N×K pieces ofdiscrete data, where N×K being an integer. In a case that a moment atwhich first discrete data is located is 0, then a moment at which seconddiscrete data is located is Ts, a moment for the third discrete data is2 Ts and a moment at which (N×K)th discrete data is located is(N×K−1)Ts. Since the length of the independent variable range of thewaveform function is also N×K, the discrete value of the waveformfunction refers to a corresponding function value when the independentvariable is 0, Ts, . . . , (N×K−1)Ts.

Optionally, when the waveform function is a discrete function, thenumber of discrete function values of the waveform function is the sameas the amount of discrete data in the time-domain data sequence obtainedby repeatedly extending the data sequence of each symbol and having thelength N×T1. The discrete function may be obtained by sampling thecontinuous function.

In the embodiment, values of N and T1 may be predetermined in astandard/protocol or set by a corresponding node. When multiple valuesare predetermined for T1, the values may also be set by a correspondingnode. For example, when the sending node is UE, a base station may setand transmit a value of T1 to the UE.

In an optional embodiment, the L continuous symbols are, but not limitedto, symbols on a subframe or resource block in the multicarrier system.The L continuous symbols may also be symbols on another resource unit.

In the embodiment of the disclosure, after the time-domain datasequences of the L continuous symbols is acquired, no CP is added to thetime-domain data sequences. Instead, cyclic shifting is performed and,after acquisition of the time-domain data sequences of the L continuoussymbols and before modulation, another processing process may be addedwithout adding a CP, so that the out-of-band leakage is suppressedrelatively well, the widths of the main lobes of the subcarriers on thefrequency domain are decreased, overlapping of the main lobes of theadjacent subcarriers is further avoided, the interference between theadjacent subcarriers is canceled, relatively high compatibility with theLTE system is achieved, and meanwhile, the demodulation performance andthe symbol interval regulation flexibility are improved by simple cyclicshifting.

In an optional embodiment, FIG. 3 is a flowchart of a data modulationmethod for a multicarrier system according to an optional embodiment ofthe disclosure. The method is applied to a sending node 12. As shown inFIG. 3, the flow includes the following operations.

In S302, IFFT is performed on five continuous symbols respectively toacquire five time-domain data sequences Z1(i), i being an integerbetween [1, 5] and a length of each data sequence Z1(i) being 1024.

In S304, cyclic shifting is performed on the five time-domain datasequences Z1(i) respectively to obtain time-domain data sequences Z2(i),a length of each data sequence Z2(i) being still 1024.

In S306, 1024-fold sampling and grouping is performed on the fivetime-domain data sequences Z2(i) to obtain 1024 sets of data sequencesS(m), m=1, 2, . . . , 1024, a length of each set of data sequences being5.

In S308, a linear operation is performed on the 1024 sets of datasequences S(m) and 1024 sets of grouped data sequences of a waveformfunction, and the operation results are interpolated and arrangedaccording to a predetermined rule to obtain a time-domain data sequenceZO.

In S310, a Digital-to-Analogue Converter (DAC) operation and a radiofrequency operation are performed on the time-domain data sequence ZOand processed data is sent through an antenna.

The above operations solve the technical problems that the related artis incapable of effectively suppressing out-of-band leakage or flexiblyadjusting a symbol interval to adapt to different channel environmentsunder the condition that the related art is incompatible with an LTEsystem and has poor demodulation performance, thereby achieving theeffects of suppressing the out-of-band leakage relatively well,decreasing widths of main lobes of subcarriers on a frequency domain,further avoiding overlapping of the main lobes of adjacent subcarriers,canceling interference of the adjacent subcarriers, achieving relativelyhigh compatibility with the LTE system and meanwhile, improvingdemodulation performance and symbol interval regulation flexibility bysimple cyclic shifting operations.

From the above descriptions about the implementation modes, thoseskilled in the art may clearly know that the method according to theabovementioned embodiments may be implemented by a combination ofsoftware and a universal hardware platform, and of course, may also beimplemented through hardware, but the former is a preferredimplementation mode under many circumstances. Based on such anunderstanding, the technical solutions of the disclosure substantiallyor the parts making contributions to the related art may be embodied bya software product. The computer software product is stored in a storagemedium (for example, a Read-Only Memory (ROM)/Random Access Memory(RAM), a magnetic disk and an optical disk), including a plurality ofinstructions which are set to enable a computer device (which may be apersonal computer, a server, a network device or the like) to executethe method in each embodiment of the disclosure.

Embodiment 2

The embodiment provides a data demodulation method for a multicarriersystem running on the network architecture shown in FIG. 1. FIG. 4 is aflowchart of a data demodulation method for a multicarrier systemaccording to an embodiment of the disclosure. As shown in FIG. 4, theflow includes the following operations.

In S402, modulated data is received, the modulated data being dataobtained by performing first cyclic shifting on data sequences of Lcontinuous symbols respectively and modulating the data sequences havingbeen subjected to the first cyclic shifting by use of a specifiedwaveform function.

In S404, demodulation is performed on the data by use of the specifiedwaveform function to obtain the data sequences of the L continuoussymbols.

Through the operations, the modulated data is demodulated and the datasequences of the L continuous symbols are obtained, thereby solving thetechnical problems that the related art is incapable of effectivelysuppressing out-of-band leakage or flexibly adjusting a symbol intervalto adapt to different channel environments under the condition that therelated art is not compatible with an LTE system and has poordemodulation performance, and achieving the effects of suppressing theout-of-band leakage relatively well, decreasing widths of main lobes ofsubcarriers on a frequency domain, further avoiding overlapping of themain lobes of adjacent subcarriers, canceling interference of theadjacent subcarriers, achieving relatively high compatibility with theLTE system and, meanwhile, improving demodulation performance and symbolinterval regulation flexibility by simple cyclic shifting operations.

In an optional embodiment, original data of the modulated data isacquired in the following manner: second cyclic shifting is performed onthe data sequences of the L continuous symbols respectively; and theoriginal data of the modulated data is acquired according to the datasequences having been subjected to the second cyclic shifting. In theembodiment, the original data is data before the received data ismodulated.

In an optional embodiment, a difference value between cyclic shifts ofadjacent symbols in the L continuous symbols is determined according toa value of T1, T1 being a symbol interval of the L continuous modulatedsymbols.

In an optional embodiment, a cyclic shift of the second cyclic shiftingand a cyclic shift of the first cyclic shifting are, but not limited tobe, opposite in direction and the same in modulus value. The cyclicshift of the second cyclic shifting and the cyclic shift of the firstcyclic shifting may be the same in direction and/or different in modulusvalue.

In an optional embodiment, FFT and channel equalization and detectionmay be performed on the data after the second cyclic shifting.

From the above descriptions about the implementation modes, thoseskilled in the art may clearly know that the method according to theabovementioned embodiments may be implemented in a manner of combiningsoftware and a universal hardware platform, and of course, may also beimplemented through hardware, but the former is a preferredimplementation mode under many circumstances. Based on such anunderstanding, the technical solutions of the disclosure substantiallyor the parts making contributions to the related art may be embodied inform of a software product, and the computer software product is storedin a storage medium (for example, a ROM/RAM, a magnetic disk and anoptical disk), including a plurality of instructions configured toenable a computer device (which may be a personal computer, a server, anetwork device or the like) to execute the method in each embodiment ofthe disclosure.

Embodiment 3

The embodiment also provides a data modulation device for a multicarriersystem. The device is configured to implement the abovementionedembodiments and preferred implementation modes. What has been describedwill not be elaborated. For example, the term “module”, used below, maybe a combination of software and/or hardware capable of realizing apreset function. Although the device described in the followingembodiment is preferably implemented with software, implementation withhardware or a combination of the software and the hardware is alsopossible and conceivable.

FIG. 5 is a structure block diagram of a data modulation device for amulticarrier system according to an embodiment of the disclosure. Asshown in FIG. 5, the device includes: a cyclic shifting module 52,configured to perform cyclic shifting on data sequences of L continuoussymbols respectively, L≥2; and a modulation module 54, configured tomodulate the cyclically shifted data sequences by use of a waveformfunction, an independent variable range of the waveform function beinggreater than or equal to a symbol interval of the L modulated symbols.

In an optional embodiment, the data sequences of the L continuoussymbols are time-domain data sequences obtained by performing IFFT onfrequency-domain data of the L continuous symbols respectively.

In an optional embodiment, the independent variable range of thewaveform function is N×T1, N being a real number greater than or equalto 1 and T1 being the symbol interval of the L continuous modulatedsymbols.

In an optional embodiment, the cyclic shifting module 52 is furtherconfigured to determine a difference value between cyclic shifts ofadjacent symbols in the L continuous symbols according to a value of T1.

In an optional embodiment, the cyclic shifts of the adjacent symbolsmeet one of the following formulae:

mod((mod(Y(i+1), T0)−mod(Y(i), T0)+T0), T0)=mod(T1, T0) and

T0−mod((mod(Y(i+1), T0)−mod(Y(i), T0)+T0), T0)=mod(T1, T0), where Y(1),Y(2) . . . Y(L) are cyclic shifts and are real numbers, i is an integerbetween [1, L−1] and T0 is a reciprocal of an interval between adjacentsubcarriers of the frequency-domain data before execution of IFFT.

In an optional embodiment, the modulation module 54 is furtherconfigured to perform independent variable shifting on the waveformfunction corresponding to the L continuous symbols and perform a groupedlinear operation on the waveform function having been subjected to theindependent variable shifting and on the cyclically shifted datasequences of the L continuous symbols.

In an optional embodiment, the modulation module 54 is furtherconfigured to perform independent variable shifting on the waveformfunction corresponding to the L continuous symbols in the followingmanner: g(t−D(i)), where g(t) is the waveform function, D(i) is anindependent variable shift of the waveform function corresponding to anith symbol, D(i+1)−D(i)=T1 and i is an integer between [1, L].

In an optional embodiment, the modulation module 54 is furtherconfigured to: perform first M-fold sampling and grouping on thecyclically shifted discrete data sequences of the L continuous symbolsto obtain M sets of data sequences S(m), m=1, 2, . . . , M, and a lengthof each set of data sequence being L; perform second M-fold sampling andgrouping on a discrete function form of g(t−D(i)) corresponding to theith symbol to obtain M sets of data sequences Yi(m), m=1, 2, . . . , M,a length of each set of data sequence being G and G being greater thanor equal to N; perform a linear operation on S(m) and L Yi(m) togenerate data sequences R(m), namely

${{R(m)} = {{S(m)} \times \begin{bmatrix}{Y\; 1(m)} \\{Y\; 2(m)} \\\vdots \\{{YL}(m)}\end{bmatrix}}},$

m=1, 2, . . . , M; and arrange the M sets of data sequences R(m)according to a predetermined rule to obtain the modulated data sequencesof the L continuous symbols, M being the number of the time-domain datasequences within time T0 and T0 being the reciprocal of the intervalbetween the adjacent subcarriers of the frequency-domain data beforeexecution of IFFT.

It is apparent that those skilled in the art should know that eachmodule or each operation of the disclosure may be implemented by auniversal computing device, and the modules or operations may beconcentrated on a single computing device or distributed on a networkformed by a plurality of computing devices, and may optionally beimplemented by program codes executable for the computing devices, sothat the modules or operations may be stored in a storage device forexecution with the computing devices, the shown or described operationsmay be executed in sequences different from those described here in somecircumstances, or may form each integrated circuit module respectively,or multiple modules or operations therein may form a single integratedcircuit module for implementation. As a consequence, the disclosure isnot limited to any specific combination of hardware and software.

Embodiment 4

The embodiment also provides a data demodulation device for amulticarrier system. The device is configured to implement theabovementioned embodiments and preferred implementation modes. What hasbeen described will not be elaborated. For example, the term “module”,used below, may be a combination of software and/or hardware capable ofrealizing a preset function. Although the device described in thefollowing embodiment is preferably implemented with software,implementation with hardware or a combination of the software and thehardware is also possible and conceivable.

FIG. 6 is a structure block diagram of a data demodulation device for amulticarrier system according to an embodiment of the disclosure. Asshown in FIG. 6, the device includes: a receiving module 62, configuredto receive modulated data, the modulated data being data obtained byperforming first cyclic shifting on data sequences of L continuoussymbols respectively and modulating the data sequences having beensubjected to the first cyclic shifting by use of a waveform function;and a demodulation module 64, configured to perform demodulation on thedata by use of the waveform function to obtain the data sequences of theL continuous symbols.

In an optional embodiment, FIG. 7 is a first structure block diagram ofa data demodulation device for a multicarrier system according to anoptional embodiment of the disclosure. As shown in FIG. 7, the deviceincludes all the modules shown in FIG. 6 and the device furtherincludes: a cyclic shifting module 72, configured to perform secondcyclic shifting on the data sequences of the L continuous symbolsrespectively; and an acquisition module 74, configured to acquireoriginal data of the modulated data according to the data sequenceshaving been subjected to the second cyclic shifting.

In an optional embodiment, the cyclic shifting module 72 is furtherconfigured to determine a difference value between cyclic shifts ofadjacent symbols in the L continuous symbols according to a value of T1,T1 being a symbol interval of the L continuous modulated symbols.

In an optional embodiment, FIG. 8 is a second structure block diagram ofa data demodulation device for a multicarrier system according to anoptional embodiment of the disclosure. As shown in FIG. 8, the deviceincludes all the modules shown in FIG. 7 and the device further includesa processing module 82, connected with the cyclic shifting module 72 andthe acquisition module 74 and configured to perform FFT and channelequalization and detection on the data.

It is apparent that those skilled in the art should know that eachmodule or each operation of the disclosure may be implemented by auniversal computing device, and the modules or operations may beconcentrated on a single computing device or distributed on a networkformed by a plurality of computing devices, and may optionally beimplemented by program codes executable for the computing devices, sothat the modules or operations may be stored in a storage device forexecution with the computing devices, the shown or described operationsmay be executed in sequences different from those described here in somecircumstances, or may form each integrated circuit module respectively,or multiple modules or operations therein may form a single integratedcircuit module for implementation. As a consequence, the disclosure isnot limited to any specific combination of hardware and software.

Embodiment 5

The embodiment also provides a multicarrier system, which is configuredto implement the abovementioned embodiments and preferred implementationmodes. What has been described will not be elaborated. Although thedevice described in the following embodiment is preferably implementedwith software, implementation with hardware or a combination of thesoftware and the hardware is also possible and conceivable.

The multicarrier system includes a sending node 12 and a receiving node14. The sending node 12 is configured to perform cyclic shifting on datasequences of L continuous symbols respectively, L≥2, and modulate thecyclically shifted data sequences by use of a specified waveformfunction, an independent variable range of the waveform function beinggreater than or equal to a symbol interval of the L modulated symbols.The receiving node 14 is configured to receive modulated data, themodulated data being data obtained by performing first cyclic shiftingon the data sequences of the L continuous symbols respectively andmodulating the data sequences having been subjected to the first cyclicshifting by use of the specified waveform function, perform demodulationon the data by use of the specified waveform function to obtain the datasequences of the L continuous symbols, perform second cyclic shifting onthe data sequences of the L continuous symbols respectively and acquireoriginal data of the modulated data according to the data sequenceshaving been subjected to the second cyclic shifting.

Embodiment 6

The embodiment of the disclosure also provides a storage medium.Optionally, in the embodiment, the storage medium may be configured tostore a program code for executing the following operations: in S1,cyclic shifting is performed on data sequences of L continuous symbolsrespectively, L≥2; in S2, the cyclically shifted data sequences aremodulated by use of a waveform function, an independent variable rangeof the waveform function being greater than or equal to a symbolinterval of the L modulated symbols.

Optionally, the storage medium is further configured to store a programcode for executing the following operation: a difference value betweencyclic shifts of adjacent symbols in the L continuous symbols isdetermined according to a value of T1.

Optionally, the storage medium is further configured to store a programcode for executing the following operation: the cyclic shifts of theadjacent symbols meet one of the following formulae:

mod((mod(Y(i+1), T0)−mod(Y(i), T0)+T0), T0)=mod(T1, T0) and

T0−mod((mod(Y(i+1), T0)−mod(Y(i), T0)+T0), T0)=mod(T1, T0), where Y(1),Y(2) . . . Y(L) are cyclic shifts and are real numbers, i is an integerbetween [1, L−1] and T0 is a reciprocal of an interval between adjacentsubcarriers of the frequency-domain data before execution of IFFT.

Optionally, the storage medium is further configured to store a programcode for executing the following operations: in S1, independent variableshifting is performed on the waveform function corresponding to the Lcontinuous symbols; in S2, a grouped linear operation is performed onthe waveform function having been subjected to the independent variableshifting and on the cyclically shifted data sequences of the Lcontinuous symbols.

Optionally, the storage medium is further configured to store a programcode for executing the following operation: independent variableshifting is performed on the waveform function corresponding to the Lcontinuous symbols in the following manner: g(t−D(i)), where g(t) is thewaveform function, D(i) is an independent variable shift of the waveformfunction corresponding to an ith symbol, D(i+1)−D(i)=T1 and i is aninteger between [1, L].

Optionally, the storage medium is further configured to store a programcode for executing the following operations. In S1, first M-foldsampling and grouping is performed on the cyclically shifted discretedata sequences of the L continuous symbols to obtain M sets of datasequences S(m), m=1, 2, . . . , M, and a length of each set of datasequence being L. In S2, second M-fold sampling and grouping isperformed on a discrete function form of g(t−D(i)) corresponding to theith symbol to obtain M sets of data sequences Yi(m), m=1, 2, . . . , M,a length of each set of data sequence being G and G being greater thanor equal to N. In S3, a linear operation is performed on S(m) and LYi(m) to generate data sequences R(m), namely

${{R(m)} = {{S(m)} \times \begin{bmatrix}{Y\; 1(m)} \\{Y\; 2(m)} \\\vdots \\{{YL}(m)}\end{bmatrix}}},$

m=1, 2, . . . , M. The M sets of data sequences R(m) are arrangedaccording to a predetermined rule to obtain the modulated data sequencesof the L continuous symbols, M being the number of the time-domain datasequences within time T0 and T0 being the reciprocal of the intervalbetween the adjacent subcarriers of the frequency-domain data beforeexecution of IFFT.

Optionally, the storage medium is further configured to store a programcode for executing the following operation: sampling is performed on acontinuous function form of the waveform function to obtain the discretefunction form of g(t−D(i)) corresponding to the ith symbol, a samplinginterval being a time interval between adjacent discrete data in thetime-domain data sequences of the L continuous symbols.

An embodiment of the disclosure also provides another storage medium.Optionally, in the embodiment, the storage medium may be configured tostore a program code for executing the following operations. In S1,modulated data is received, the modulated data being data obtained byperforming first cyclic shifting on data sequences of L continuoussymbols respectively and modulating the data sequences having beensubjected to the first cyclic shifting by use of a specified waveformfunction. In S2, demodulation is performed on the data by use of thespecified waveform function to obtain the data sequences of the Lcontinuous symbols.

Optionally, the storage medium is further configured to store a programcode for executing the following operations. In S1, second cyclicshifting is performed on the data sequences of the L continuous symbolsrespectively. In S2, original data of the modulated data is acquiredaccording to the data sequences having been subjected to the secondcyclic shifting.

Optionally, the storage medium is further configured to store a programcode for executing the following operation: FFT and channel equalizationand detection are performed on the data.

Optionally, in the embodiment, the storage medium may include, but notlimited to various media capable of storing a program code, such as a Udisk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a mobilehard disk, a magnetic disk or an optical disk.

Optionally, specific examples in the embodiment may refer to theexamples described in the abovementioned embodiments and optionalimplementation modes and will not be elaborated in the embodiment.

Obviously, those skilled in the art should know that each module or eachoperation of the disclosure may be implemented by a universal computingdevice, and the modules or operations may be concentrated on a singlecomputing device or distributed on a network formed by a plurality ofcomputing devices, and may optionally be implemented by program codesexecutable for the computing devices, so that the modules or operationsmay be stored in a storage device for execution with the computingdevices, and furthermore, the illustrated or described operations may beexecuted in sequences different from those described here in somecircumstances, or may form each integrated circuit module respectively,or multiple modules or operations therein may form a single integratedcircuit module for implementation. As a consequence, the disclosure isnot limited to any specific combination of hardware and software.

The above is only the preferred embodiment of the disclosure and notintended to limit the disclosure. For those skilled in the art, thedisclosure may have various modifications and variations. Anymodifications, equivalent replacements, improvements and the like madewithin the spirit and principle of the disclosure shall fall within thescope of protection of the disclosure.

INDUSTRIAL APPLICABILITY

Through the embodiments of the disclosure, cyclic shifting is performedon the data sequences of the L continuous symbols respectively, L≥2; andthe cyclically shifted data sequences are modulated by use of a waveformfunction, the independent variable range of the waveform function beinggreater than or equal to the symbol interval of the L modulated symbols.Therefore, the technical problems of incapability of effectivelysuppressing out-of-band leakage or flexibly adjusting a symbol intervalto adapt to different channel environments under the condition that therelated art is incompatible with an LTE system and has poor demodulationperformance are solved, thus achieving the effects of suppressing theout-of-band leakage relatively well, decreasing widths of main lobes ofsubcarriers on a frequency domain, further avoiding overlapping of themain lobes of adjacent subcarriers, canceling interference between theadjacent subcarriers, achieving relatively high compatibility with theLTE system and, meanwhile, improving demodulation performance and symbolinterval regulation flexibility by simple cyclic shifting operations.

1. A data modulation method for a multicarrier system, comprising:performing cyclic shifting on data sequences of L continuous symbolsrespectively, L≥2; and modulating the cyclically shifted data sequencesby use of a waveform function, wherein an independent variable range ofthe waveform function is N×T1, T1 is a symbol interval of the Lcontinuous symbols having been subjected to the modulation, N is a realnumber greater than or equal to
 1. 2.-3. (canceled)
 4. The method ofclaim 1, further comprising: determining a difference value betweendifferent cyclic shifts of adjacent symbols in the L continuous symbolsaccording to a value of T1.
 5. The method of claim 4, wherein the cyclicshifts of the adjacent symbols meet one of following formulae:mod((mod(Y(i+1), T0)−mod(Y(i), T0)+T0), T0)=mod(T1, T0); andT0−mod((mod(Y(i+1), T0)−mod(Y(i), T0)+T0), T0)=mod(T1, T0), where Y(1),Y(2) . . . Y(L) are the cyclic shifts and are real numbers, i is aninteger between [1, L−1] and T0 is a reciprocal of an interval betweenadjacent subcarriers in the multicarrier system.
 6. The method of claim1, wherein the modulation comprises Filter Bank (FB) modulation.
 7. Themethod of claim 1, wherein the waveform function comprises one of: aroot raised cosine function, a raised cosine function, a piecewisefunction and a rectangular function. 8.-10. (canceled)
 11. The method ofclaim 1, wherein modulating the cyclically shifted data sequences of theL continuous symbols by use of the waveform function comprises:performing independent variable shifting on the waveform functioncorresponding to the L continuous symbols respectively; and performing agrouped linear operation on the waveform function having been subjectedto the independent variable shifting and the cyclically shifted datasequences of the L continuous symbols.
 12. The method of claim 11,wherein the independent variable shifting is performed on the waveformfunction corresponding to the L continuous symbols in a followingmanner: g(t−D(i)), where g(t) is the waveform function, D(i) is anindependent variable shift of the waveform function corresponding to anith symbol, D(i+1)−D(i)=T1 and i is an integer between [1, L].
 13. Themethod of claim 12, wherein performing the grouped linear operation onthe waveform function having been subjected to the independent variableshifting and the cyclically shifted data sequences of the L continuoussymbols comprises: performing first M-fold sampling and grouping oncyclically shifted discrete data sequences of the L continuous symbolshaving been subjected to the cyclical shifting to obtain M sets of datasequences S(m), m=1, 2, . . . , M and a length of each set of datasequence being L; performing second M-fold sampling and grouping on adiscrete function form of g(t−D(i)) corresponding to the ith symbol toobtain M sets of data sequences Yi(m), m=1, 2, . . . , M, a length ofeach set of data sequence being G and G being greater than or equal toN; performing a linear operation on S(m) and L Yi(m) to generate datasequences R(m), that is ${{R(m)} = {{S(m)} \times \begin{bmatrix}{Y\; 1(m)} \\{Y\; 2(m)} \\\vdots \\{{YL}(m)}\end{bmatrix}}},$  m=1, 2, . . . , M; and arranging the M sets of datasequences R(m) according to a predetermined rule to obtain the modulateddata sequences of the L continuous symbols, M being the number of thetime-domain data sequences within time T0 and T0 being the reciprocal ofan interval between adjacent subcarriers in the multicarrier system.14.-15. (canceled)
 16. A data demodulation method for a multicarriersystem, comprising: receiving modulated data, the modulated data beingdata obtained by performing first cyclic shifting on data sequences of Lcontinuous symbols respectively and modulating the data sequences havingbeen subjected to the first cyclic shifting by use of a waveformfunction; and performing demodulation on the data by use of the waveformfunction to obtain the data sequences of the L continuous symbols. 17.The method of claim 16, further comprising: performing second cyclicshifting respectively on the data sequences of the L continuous symbolshaving been subjected to the first cyclic shifting; and acquiringoriginal data of the modulated data according to the data sequenceshaving been subjected to the second cyclic shifting.
 18. The method ofclaim 17, further comprising: determining a difference value betweencyclic shifts of adjacent symbols in the L continuous symbols accordingto a value of T1, T1 being a symbol interval of the L continuous symbolshaving been subjected to the modulation.
 19. The method of claim 17,wherein a cyclic shift of the second cyclic shifting and a cyclic shiftof the first cyclic shifting are opposite in direction and the same inmodulus value.
 20. (canceled)
 21. A data modulation device for amulticarrier system, comprising: a processor and a memory configured tostore a computer program runnable on the processor, wherein theprocessor is configured to perform cyclic shifting on data sequences ofL continuous symbols respectively, L≥2; and to modulate the cyclicallyshifted data sequences by use of a waveform function, wherein anindependent variable range of the waveform function is N×T1, T1 is asymbol interval of the L symbols having been subjected to themodulation, and N is a real number greater than or equal to
 1. 22.-23.(canceled)
 24. The device of claim 21, wherein the processor is furtherconfigured to determine a difference value between different cyclicshifts of adjacent symbols in the L continuous symbols according to avalue of T1.
 25. The device of claim 24, wherein the cyclic shifts ofthe adjacent symbols meet one of following formulae: mod((mod(Y(i+1),T0)−mod(Y(i), T0)+T0), T0)=mod(T1, T0) and T0−mod((mod(Y(i+1),T0)−mod(Y(i), T0)+T0), T0)=mod(T1, T0), where Y(1), Y(2) . . . Y(L) arethe cyclic shifts and are real numbers, i is an integer between [1, L−1]and T0 is a reciprocal of an interval between adjacent subcarriers inthe multicarrier system.
 26. The device of claim 21, wherein theprocessor is further configured to perform independent variable shiftingon the waveform function corresponding to the L continuous symbols andperform a grouped linear operation on the waveform function having beensubjected to the independent variable shifting and the cyclicallyshifted data sequences of the L continuous symbols.
 27. The device ofclaim 26, wherein the processor is further configured to perform theindependent variable shifting on the waveform function corresponding tothe L continuous symbols in a following manner: g(t−D(i)), where g(t) isthe waveform function, D(i) is an independent variable shift of thewaveform function corresponding to an ith symbol, D(i+1)−D(i)=T1 and iis an integer between [1, L].
 28. (canceled)
 29. A data demodulationdevice for a multicarrier system, comprising: a processor and a memoryconfigured to store a computer program runnable on the processor,wherein the processor is configured to receive modulated data, themodulated data being data obtained by performing first cyclic shiftingon data sequences of L continuous symbols respectively and modulatingthe data sequences having been subjected to the first cyclic shifting byuse of a waveform function; and to perform demodulation on the data byuse of the waveform function to obtain the data sequences of the Lcontinuous symbols.
 30. The device of claim 29, wherein the processor isfurther configured to perform second cyclic shifting respectively on thedata sequences of the L continuous symbols having been subjected to thefirst cyclic shifting; and to acquire original data of the modulateddata according to the data sequences having been subjected to the secondcyclic shifting.
 31. The device of claim 30, wherein the processor isfurther configured to determine a difference value between cyclic shiftsof adjacent symbols in the L continuous symbols according to a value ofT1, T1 being a symbol interval of the L continuous symbols having beensubjected to the modulation. 32.-33. (canceled)
 34. A storage medium,comprising a stored program which is, when run, to execute the method ofclaim
 1. 35. A storage medium, comprising a stored program which is,when run, to execute the method of claim 16.